diff --git a/src/des/new_rnd_key.c b/src/des/new_rnd_key.c
index ca152b7ef9..c22b296ae7 100644
--- a/src/des/new_rnd_key.c
+++ b/src/des/new_rnd_key.c
@@ -50,7 +50,11 @@ static int is_inited = 0;
  */
 
 #include <assert.h>
-pthread_mutex_t des_init_mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_mutex_t des_init_mutex
+#ifdef PTHREAD_MUTEX_INITIALIZER
+= PTHREAD_MUTEX_INITIALIZER
+#endif
+;
 #define LOCK_INIT assert(pthread_mutex_lock(&des_init_mutex)==0)
 #define UNLOCK_INIT assert(pthread_mutex_unlock(&des_init_mutex)==0)
 #else
@@ -189,7 +193,11 @@ static unsigned char sequence_number[8];
  */
 
 #include <assert.h>
-pthread_mutex_t des_random_mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_mutex_t des_random_mutex
+#ifdef PTHREAD_MUTEX_INITIALIZER
+= PTHREAD_MUTEX_INITIALIZER
+#endif
+;
 #define LOCK_RANDOM assert(pthread_mutex_lock(&des_random_mutex)==0)
 #define UNLOCK_RANDOM assert(pthread_mutex_unlock(&des_random_mutex)==0)
 #else
diff --git a/src/rxkad/rxkad_server.c b/src/rxkad/rxkad_server.c
index 91e384caa4..7638482daf 100644
--- a/src/rxkad/rxkad_server.c
+++ b/src/rxkad/rxkad_server.c
@@ -78,7 +78,11 @@ static fc_KeySchedule random_int32_schedule;
  */
 
 #include <assert.h>
-pthread_mutex_t rxkad_random_mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_mutex_t rxkad_random_mutex
+#ifdef PTHREAD_MUTEX_INITIALIZER
+= PTHREAD_MUTEX_INITIALIZER
+#endif
+;
 #define LOCK_RM assert(pthread_mutex_lock(&rxkad_random_mutex)==0)
 #define UNLOCK_RM assert(pthread_mutex_unlock(&rxkad_random_mutex)==0)
 #else